Abstract: A modified receiving coil derived from the BP( Bipolar Pad) coil structure is proposed to address the problem of mutual inductance dips and increased mutual inductance fluctuations in the process of wireless charging of dynamic electric vehicles using magnetically coupled resonant radio energy transmission technology during straight-line driving and turning. The modified coil solves the problem of reduced effective area of positive pair coupling caused by decoupling of conventional BP coils by means of double coils fitted to the inner and outer diameter of the track respectively, and Ansys / Maxwell software is used to carry out simulation to find out the reasonable design position and relative size of the compensation coil. The experimental data shows that the new receiver coil can suppress the mutual inductance fluctuation and enhance the mutual inductance value to a certain extent, in the process of turning and driving in a straight line. The peak mutual inductance fluctuation rate is 5. 1% , and the maximum mutual inductance reception is 28. 7% higher than that of the traditional BP coil.

Key words: dynamic wireless charging, mutual inductance drop, mutual induction of curve, bipolar pad ( BP) coil